Lighting

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📄 The Comparison of Constant and Dynamic Red and Blue Light Irradiation Effects on Red and Green Leaf Lettuce

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Submitted by Elsewhere on 2020-Nov-16 Mon 19:27
2152

In this study, we sought to evaluate and compare the effects of constant and dynamic lighting on red and green leaf lettuce (Lactuca sativa L. Red Cos and Lobjoits Green cos) cultivated in a controlled environment. Plants were illuminated with the combination of red 662 and 638 nm, blue 452 nm, and far-red 737 nm at 16 h photoperiod and constant daily light integral (DLI) of each component. Five constant or dynamic lighting treatments were performed: (BR) constant flux of both B452 and R662; (B*R) constant flux of R662, but the DLI of B452 condensed in 8 h in the middle of photoperiod doubling the PPFD of blue light; (BR*) constant flux of B452, but the DLI of R662 light condensed in the middle of photoperiod; (BdynR) constant flux of R662, but the flux of B452 varies in the sinusoidal profile during 16 h photoperiod, imitating diurnal increase and decrease in lighting intensity; and (BRdyn) constant flux of B452, but the flux of R662 varies in sinusoidal profile. The lettuce’s response to dynamic lighting strategies was cultivar specific. Dynamic lighting strategies, mimicking natural lighting fluctuations, did not have a remarkable effect on photosynthesis and antioxidative parameters, but the dynamic flux of blue light component had a pronounced effect on higher macro and microelement contents in lettuce leaves.

The importance of light controllability for plant growth

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Submitted by Elsewhere on 2020-Nov-10 Tue 12:26
2097

One of the most critical challenges—whether for greenhouse managers or for horticulture aficionados—is to provide plants with enough photoperiodic sunlight for effective photosynthesis, so that they can grow optimally regardless of the geographical location and climate. Winter months even in supposedly…

Screens: Leave the truss alone!

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Submitted by Elsewhere on 2020-Nov-05 Thu 10:10
2056

In relatively hot climates like most of Australia, using an automated Shade or Energy Screen is an indispensable tool, but it is also a compromise – it’s really good at cooling the greenhouse, or really good at keeping it warm, but it can’t do both very well. So, Growers are increasingly opting for Double Screens – one screen…

Arthropods and greenhouse lighting: Like moths to a flame

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Submitted by Elsewhere on 2020-Nov-04 Wed 19:21
2048

It is well-known that artificial lights can significantly improve crop production. Despite this, little research to date has examined how new light environments impact greenhouse crop protection – both the good bugs and the bad. We know that light impacts arthropods (insects and mites), such as when mayflies are drawn to streetlights, and moths to flames. But how important is it really to greenhouse pest management?

📄 Responses of cucumber seedlings to supplemental LED light

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Submitted by Elsewhere on 2020-Nov-03 Tue 07:37
2030

In order to inhibit spindling growth and improve quality of cucumber seedlings under low irradiance, effects of supplemental light-emitting diodes (LED) light (SL) on morphological and physiological characteristics of cucumber seedlings at different growth stages under extremely low irradiance (ELI) were…

Kingsville approves bylaw against greenhouse light pollution

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Submitted by Elsewhere on 2020-Oct-27 Tue 08:59
1944

The Town of Kingsville Council has passed a bylaw to crack down on greenhouse growers using lamps that produce a nighttime glow that can often be seen from dozens of kilometres away. According to a report from the town, several local greenhouse operations have site plan agreements that require "dark sky…

New OEM-agreement for shelf-and-lighting panels for vertical farming

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Submitted by Elsewhere on 2020-Oct-20 Tue 09:35
1862

Senmatic and LED iBond International have entered a strategic partnership for OEM delivery of shelves with built-in grow light to be included in Senmatic’s offering of industrial vertical farming solutions. The new vertical farming shelves are based on LED iBond’s patented lighting fixture, which…

Key points of choosing grow lights for greenhouses

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Submitted by Elsewhere on 2020-Oct-20 Tue 09:34
1866

As the number of horticulture light brands on the market increases, the difficulty for growers in choosing the right product also increases. As lighting represents an important investment in the entire project, what are the key points that decision-makers need to pay attention to? Making an informed…

LED lighting helps Canadian vertical farm to increase food production all year round

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Submitted by Elsewhere on 2020-Oct-16 Fri 13:52
1841

GoodLeaf Community Farms in Canada selected Signify to equip its new state-of-the-art farm with Philips Horticulture LED lighting. As a branded producer, GoodLeaf grows and packs fresh, nutritious, and pesticide-free micro and baby greens year-round. The company operates a 4,000-square-metre indoor vertical farm in Guelph, Ontario, which is now fully operational to supply some of the largest Canadian retail chains. GoodLeaf is backed by McCain Foods as its strategic investor.

Interpretation and evaluation of electrical lighting in plant factories

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Submitted by Elsewhere on 2020-Oct-15 Thu 12:44
1819

In plant factories, light is fully controllable for crop production but involves a cost. For efficient lighting, light use efficiency (LUE) should be considered as part of light environment design.   The objectives of a new study were to evaluate and interpret the light interception, photosynthetic rate, and LUE…

The coupling of nanotechnology and luminescent films to optimize greenhouse light quality

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Submitted by Elsewhere on 2020-Oct-12 Mon 12:24
1777

“UbiGro is essentially a layer of light in a greenhouse,” according to UbiQD’s chief of product, Matt Bergren, who enthusiastically described how the company’s UbiGro luminescent greenhouse film and its embedded nanotechnology facilitate light management in greenhouse settings. Based in New Mexico and established in 2014, UbiQD is harnessing nanotechnology for various applications, one of which is the optimization of greenhouse light quality through its UbiGro luminescent greenhouse gilms. UbiGro films use quantum dots to convert UV and blue photons to longer wavelengths, resulting in the emission of orange/red light. Otherwise stated, UbiGro is a photoluminescent film that glows when illuminated with sunlight due to the conversion of short wavelengths to long wavelengths. This allows growers to harness various wavelengths for photosynthesis and improve crop yields.

Light from top to bottom

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Submitted by Elsewhere on 2020-Oct-12 Mon 12:24
1778

The use of high-tech greenhouse facilities and vertical farms for fruit and vegetable crop cultivation is skyrocketing in certain parts of the globe as a response to increased demand for fresh produce, less reliable weather conditions and the rising scarcity of cultivable farmland. Precision farming ensures all-year production, higher yields, improvement in product quality and higher marketable value. Modern indoor farming technologies offer the possibility to boost plant density as compared with open field cultivation. However, failing to provide adequate lighting at the necessary points in a dense canopy is bound to result in suboptimal crop yields. For instance, using more toplight modules will only lead to a bigger electricity bill while the lower parts of the plants will still not receive the proper amount of light.

Impact of UV-C radiation on disease sensitivity and fruit quality of strawberry

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Submitted by Elsewhere on 2020-Oct-08 Thu 11:03
1731

Ultraviolet-C (UV-C) radiation is efficient in reducing the development of diseases in many species, including strawberry (Fragaria × ananassa). Several studies suggest that UV-C radiation is effective not only because of its disinfecting effect but also because it may stimulate plant defenses. In a new…

IAG germination grow room provides the right lighting spectrum

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Submitted by Elsewhere on 2020-Oct-05 Mon 15:31
1673

IAG's germination grow room, where seedlings are planted, provides the right lighting spectrum to start the growing process. 🍀

Learn more: iagri-tech.com #innovation # #sustainablefood #agriculture #agritech #indoorfarming pic.twitter.com/hL42MiivqV

 

See how Pao Tau Enterprises retrofitted their greenhouses with P.L. Light Systems NXT-LP luminaires

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Submitted by Elsewhere on 2020-Oct-05 Mon 13:37
1663

See how Pao Tau Enterprises retrofitted their greenhouses with P.L. Light Systems NXT-LP luminaires helping them to achieve greater light uniformity and efficiency while improving overall plant growth! pllight.com/projects/pao-t…

Bringing year-round local supply to Canada by lighting up greenhouses

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Submitted by Elsewhere on 2020-Sep-29 Tue 09:41
1587

Red Sun Farms, a North American greenhouse grower with locations in Canada, USA, and Mexico, are embracing technology by lighting up a high-tech greenhouse to bring a year-round supply from Canada. There are three distinct projects underway in support of year-round Ontario grown produce: First, a new state of…

End-Of-Day LED Lightings Influence the Leaf Color, Growth and Phytochemicals in Two Cultivars of Lettuce

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Submitted by Elsewhere on 2020-Sep-26 Sat 15:00
1556

Four light treatments (W: white light; EOD-B: end-of-day enhanced blue light; EOD-FR: end-of-day supplementary far-red light; EOD-UV: end-of-day supplementary ultraviolet-A light) were designed to explore the effects of end-of-day (EOD) lightings (30 min before dark period) on leaf color, biomass and phytochemicals accumulation in two lettuce cultivars (Lactuca sativa cv. ‘Red butter’ and ‘Green butter’) in artificial light plant factory. EOD-FR stimulated the plant and shoot biomass of two cultivars, and EOD-B suppressed the growth of ‘Red butter’ but induced higher biomass in ‘Green butter’. EOD lightings generated brighter, greener and yellower leaf in ‘Red butter’ at harvest, but the highest lightness and the deepest redness of ‘Green butter’ leaf were observed in the middle growth stage. ‘Red butter’ had prominent higher contents of chlorophylls and carotenoids, while these pigments showed less sensitivity to the interaction of cultivars and EOD lightings. EOD lightings impeded the accumulation of anthocyanin in two cultivars, except EOD-UV slightly increased the anthocyanin contents in ‘Green butter’.

What's the difference between broad full spectrum LEDs and red/blue LEDs?

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Submitted by Elsewhere on 2020-Sep-23 Wed 13:18
1501

Growers generally have two options when it comes to horticultural LED spectrums – “full spectrum or broad-spectrum, which appears as white light; and red/blue spectrum, which can appear as purple or pink light.    

Microbe–Plant Growing Media Interactions Modulate the Effectiveness of Bacterial Amendments on Lettuce Performance inside a Plant Factory with Artificial Lighting

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Submitted by Elsewhere on 2020-Sep-23 Wed 13:11
1508

There is a need for plant growing media that can support a beneficial microbial root environment to ensure that optimal plant growth properties can be achieved. We investigated the effect of five rhizosphere bacterial community inocula (BCI S1–5) that were collected at three open field organic farms and two soilless farms on the performance of lettuce (Lactuca sativa L.). The lettuce plants were grown in ten different plant growing media (M1–10) composed of 60% v/v peat (black peat or white peat), 20% v/v other organics (coir pith or wood fiber), 10% v/v composted materials (composted bark or green waste compost) and 10% v/v inorganic materials (perlite or sand), and one commercial plant growing medium inside a plant factory with artificial lighting. Fractional factorial design of experiments analysis revealed that the bacterial community inoculum, plant growing medium composition, and their interaction determine plant performance. The impact of bacterial amendments on the plant phenotype relied on the bacterial source. For example, S3 treatment significantly increased lettuce shoot fresh weight (+57%), lettuce head area (+29%), root fresh weight (+53%), and NO3-content (+53%), while S1 treatment significantly increased lettuce shoot dry weight (+15%), total phenolic content (+65%), and decreased NO3-content (−67%). However, the effectiveness of S3 and S1 treatment depended on plant growing medium composition.

Making the light what you need it to be

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Submitted by Elsewhere on 2020-Sep-16 Wed 08:59
1334

“We want to integrate our system with equipment that growers already have. There are many people working for horticulture, so a grower needs to work with lighting companies, research universities. They give recipes and recommendations, and the technology comes together with us. We want to make sure that…

DesignLight Consortium released version 2.0 of Technical Requirements for Horticultural LED

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Submitted by Elsewhere on 2020-Sep-15 Tue 08:18
1322

The DesignLights Consortium (DLC) today released the final version of its Technical Requirements for LED-based Horticultural Lighting: Version 2.0, an update that will continue the industry transition from traditional lighting data and metrics to horticultural-specific lighting data and metrics that best…

Tinted solar panels allow plants to grow efficiently on ‘agrivoltaic’ farms

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Submitted by Elsewhere on 2020-Sep-10 Thu 10:25
1293

Tinted solar panels could allow land to be used to grow crops and generate electricity simultaneously, with financial gains, according to researchers in the UK and Italy. The orange solar panels absorb some wavelengths of light, while allowing those that are best for plant growth to pass through. The…

Comparison of costs in greenhouse cucumber with LED or HPS

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Submitted by Elsewhere on 2020-Sep-08 Tue 10:12
1262

The amount of energy used in agricultural production, processing and distribution is constantly increasing. During the winter months in the greenhouse production industry, the supplemental lighting required to keep up production levels results in high expenditure. Current technology uses broadband…

Far-red light enhances density of tomato seedlings

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Submitted by Elsewhere on 2020-Sep-03 Thu 09:28
1217

Brandon Huber, a Ph.D. candidate of Horticultural Science, shared some of his tomato research to help people better understand indoor controlled environmental horticulture and its impact on young plant production. While studying indoor controlled environmental horticulture under the direction of Ricardo…

Effect of different LEDs on Chinese kale

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Submitted by Elsewhere on 2020-Aug-26 Wed 11:04
1130

Growth, Nutritional Quality and Health-Promoting Compounds in Chinese Kale Grown under Different Ratios of Red:Blue LED Lights Chinese kale is one of the healthiest vegetables, rich in health-promoting phytochemicals, including carotenoids, vitamin C, amino acid, glucosinolates, anthocyanin, flavonoids…

New GrowSpan light deprivation greenhouses

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Submitted by Elsewhere on 2020-Aug-20 Thu 05:13
1085

GrowSpan Greenhouse Structures released their innovative Series 750 Commercial Greenhouse. The greenhouse features an internal light deprivation system that is fully automated. GrowSpan has kept all the benefits of traditional light deprivation systems, but simplified the design. This not only leads to a…

Best types of grow lights for flower and bloom grow cycle

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Submitted by Elsewhere on 2020-Aug-18 Tue 10:03
1072

When growing in a commercial greenhouse, all aspects need to be controlled and kept at the optimum levels for plants to grow and thrive. Anything less than optimal will lead to undue stress and will affect the overall quality and yields of crops. Proper lighting is one of the essential elements in a…

Exploring the impact of light on tomato plants and yield

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Submitted by Elsewhere on 2020-Aug-13 Thu 10:07
1032

It's time for another Fluence research webinar, August 27 at 3 PM CEST, 8 AM CST. In this episode, Fluence experts from the Horticulture Service and Research teams will discuss two crucial experiments - conducted in collaboration with Wageningen University in the Netherlands - that improve our collective…

More light into the greenhouse in three steps

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Submitted by Elsewhere on 2020-Aug-13 Thu 10:05
1038

An old growers' saying has it that 1% more light yields 1% higher production. Scientists have since shown that this is in fact a bit more nuanced: depending on the crop this varies from 0.5% to 1.25%. However, the principle remains the same; during a large part of the year all of the sunlight can…

Webinar on how O2 and photosynthesis influence cultivation

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Submitted by Elsewhere on 2020-Aug-12 Wed 09:33
1017

In an upcoming 30MHz webinar, Aryan Aziezie will bring you up to speed on the Sendot sensor portfolio and the insights their optical sensor technology provides. Sendot has seen some significant results when it comes to capturing O2 and photosynthesis data. Resulting in more efficiency improved production…